chore(deps): update dependency google-cloud-speech to v2.5.1 (#214)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [google-cloud-speech](https://github.com/googleapis/python-speech) | `==2.5.0` -> `==2.5.1` | [![age](https://badges.renovateapi.com/packages/pypi/google-cloud-speech/2.5.1/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/pypi/google-cloud-speech/2.5.1/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/pypi/google-cloud-speech/2.5.1/compatibility-slim/2.5.0)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/pypi/google-cloud-speech/2.5.1/confidence-slim/2.5.0)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

<details>
<summary>googleapis/python-speech</summary>

### [`v2.5.1`](https://github.com/googleapis/python-speech/blob/master/CHANGELOG.md#&#8203;251-httpswwwgithubcomgoogleapispython-speechcomparev250v251-2021-07-21)

[Compare Source](https://github.com/googleapis/python-speech/compare/v2.5.0...v2.5.1)

</details>

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packages/google-cloud-python-speech/samples/microphone/requirements.txt

@@ -1,4 +1,4 @@
-google-cloud-speech==2.5.0
+google-cloud-speech==2.5.1
 pyaudio==0.2.11
 six==1.16.0
 

packages/google-cloud-python-speech/samples/snippets/requirements.txt

@@ -1,2 +1,2 @@
-google-cloud-speech==2.5.0
+google-cloud-speech==2.5.1
 google-cloud-storage==1.41.1